Question

Root hair cells under ordinary conditions typically have a $\Psi$ in the range of

• A. 1 to 4 bars
• B. -1 to 4 bars
• C. 1 to 2 bars
• D. -1 to -2 bars

Answer 1

Answer: (D)

-1 to -2 bars

$\Psi$ refers to the water potential. Water potential is the chemical free energy of water in its purest form. The concept of water potential was given by Staylor and Taylor. Water potential can be determined by the diffusion pressure deficit (DPD). The water potential of a solution is always negative. Root hair cells are developed in outer part of roots. Under ordinary conditions, root hair cells have water potential ($\Psi$) in the range of -1 to -2 bars.

So, the correct answer is option D.